﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.International.Converters.PinYinConverter;

namespace ConsoleApp.Classex
{
    public static class StringEx
    {
        public static string ToPinYin(this string input)
        {
            StringBuilder sb = new StringBuilder();
            foreach (char obj in input)
            {
                try
                {
                    ChineseChar chineseChar = new ChineseChar(obj);
                    string t = chineseChar.Pinyins[0].ToString();
                    sb.Append(t.Substring(0, t.Length - 1));
                }
                catch
                {
                    sb.Append(obj.ToString());
                }
            }
            return sb.ToString(); 
        }

        public static string ToFirstPinYin(this string input)
        {
            StringBuilder sb = new StringBuilder();
            foreach (char obj in input)
            {
                try
                {
                    ChineseChar chineseChar = new ChineseChar(obj);
                    string t = chineseChar.Pinyins[0].ToString();
                    sb.Append(t.Substring(0, 1));
                }
                catch
                {
                    sb.Append(obj.ToString());
                }
            }
            return sb.ToString();
        } 

        #region 判断字符串是不是身份证号       
        public static bool IsIdCard(this string idCard)
        {
            if (idCard.Length == 18)
            {
                return CheckIDCard18(idCard);
            }
            else if (idCard.Length == 15)
            {
                return CheckIDCard15(idCard);
            }
            else
            {
                return false;
            }
        }

        /// <summary>
        /// 18位身份证号码=6位地区代码+8位生日+3位编号+1位检验码
        /// </summary>
        /// <param name="Id"></param>
        /// <returns></returns>
        private static bool CheckIDCard18(string Id)
        {
            long n = 0;
            //数字验证
            if (long.TryParse(Id.Remove(17), out n) == false || n < Math.Pow(10, 16) || long.TryParse(Id.Replace('x', '0').Replace('X', '0'), out n) == false)
            {
                return false;
            }

            string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
            //省份验证
            if (address.IndexOf(Id.Remove(2)) == -1)
            {
                return false;
            }

            string birth = Id.Substring(6, 8).Insert(6, "-").Insert(4, "-");
            DateTime time = new DateTime();
            //生日验证
            if (DateTime.TryParse(birth, out time) == false)
            {
                return false;
            }

            //校验码验证
            string[] arrVarifyCode = ("1,0,x,9,8,7,6,5,4,3,2").Split(',');
            string[] Wi = ("7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2").Split(',');
            char[] Ai = Id.Remove(17).ToCharArray();
            int sum = 0;
            for (int i = 0; i < 17; i++)
            {
                sum += int.Parse(Wi[i]) * int.Parse(Ai[i].ToString());
            }

            int y = -1;
            Math.DivRem(sum, 11, out y);
            if (arrVarifyCode[y] != Id.Substring(17, 1).ToLower())
            {
                return false;
            }

            //符合GB11643-1999标准
            return true;
        }

        /// <summary>
        /// 15位身份证号码=6位地区代码+6位生日+3位编号
        /// </summary>
        /// <param name="Id"></param>
        /// <returns></returns>
        private static bool CheckIDCard15(string Id)
        {
            long n = 0;
            //数字验证
            if (long.TryParse(Id, out n) == false || n < Math.Pow(10, 14))
            {
                return false;
            }

            //省份验证
            string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
            if (address.IndexOf(Id.Remove(2)) == -1)
            {
                return false;
            }

            //生日验证
            string birth = Id.Substring(6, 6).Insert(4, "-").Insert(2, "-");
            DateTime time = new DateTime();
            if (DateTime.TryParse(birth, out time) == false)
            {
                return false;
            }

            //符合15位身份证标准
            return true;
        }
        #endregion
    }
}